Telkom - incorrect billing

It has been several months since I first complained about my incorrect Telkom billing. The month after registering my complaint on Hellopeter, I was contacted and requested to provide my telephone contact number and e-mail address. Since providing these,..... nothing! I have continued to receive incorrect bills from which I have been able to glean what the correct charges should have been and paid those studiously. The extra services and incorrect (cancelled) contract charges continue to appear on my account. This bill has consequently ballooned to over R2,500! This month however I have not even received a bill!! How are these clowns even still in business?